Upgraded Windows 10 Home to Windows 10 Pro and Now Stuck. Windows Won't Load.

[Blue Bulldog]

I decided to upgrade my gaming laptop from Windows 10 Home (64-bit) to Windows 10 Pro (64-bit) because I need the Pro version for my college IT classes. I bought the activation code online and at first, it wouldn't work and I kept getting an error saying to retry activation or contact Microsoft support. Then I contacted Microsoft support and did a remote session where the Microsoft tech pushed the Windows 10 Pro activation through and everything was going fine. It got to 100% and then restarted the computer. I waited for many hours last night as the computer kept restarting itself. I fell asleep and figured it would be ready in the morning. This morning, I went to use my laptop and noticed it's STILL stuck. It just shows the constant spinning circle and nothing is happening. It was left on for 16 hours so it should have been completed ages ago. I can't access the safe boot mode or anything else. If I turn the computer off by holding the power button and then turn it back on, it just goes right back to that spinning circle and I never get the chance to access safe mode or the recovery panel or anything like that. I was able to access the BIOS and wanted to try to boot from a USB or CD/DVD so I could boot from the Windows recovery disc but for some reason, the BIOS won't give me that option. The only boot option listed is to boot from the WD Hybrid HDD/SSD drive. I REALLY don't want to have to do a factory reset and lose all my games, movies, pictures, all that stuff. I don't even know if I can access the factory recovery section. I'm typing this on my desktop computer which is connected to a WD external backup drive 24/7 but I haven't backed up my laptop in months. Anyone have any tips or advice on what I can do? I'm pretty frustrated with the Microsoft tech because they assured me it would be fine and now I might lose everything on my laptop. If it matters, my laptop is the Lenovo Y50-70 purchased in late 2015. If anyone can help me so I don't lose everything, you have no idea how happy you will make me. Thank you in advance.

I should add that I'm in college/university for IT and have worked as a computer tech or helpdesk tech on and off for several years. I'm studying to take my A+ cert soon. I know how to do basic troubleshooting but I'm sure many in here are far more advanced.

These are pics of the spinning circle screen that I keep getting:

http://i.imgur.com/ADtjF3a.jpg

http://i.imgur.com/Er9AefK.jpg

http://i.imgur.com/zPWiiWh.jpg

http://i.imgur.com/MBqxzFT.jpg

 

[maikutech]

Read this first here so you will know how to boot from your usb flash drive.
Make sure to use a good 8gb sandisk flash drive, you can pick one up from a local pharmacy like walgreens.
http://www.eightforums.com/installation-setup/66233-lenovo-y50-70-a.html

As for the problem itself, the product key you have now, did microsoft rep or the email say if it was a full product key or upgrade key ?

http://www.howtogeek.com/224342/how-to-clean-install-windows-10/

If you want to keep whateever documents you want, get a live linux dvd.
Boot from it, use a good flash drive or external drive, move what you want from it.

https://en.opensuse.org/SDB:Live_CD_installation

Then if you have a windows 7 dvd or premade flash drive using windows 7 usb dvd tool.
https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool
Run the windows 7 installation, delete your primary partition, now hit the escape button to leave.

Get your windows 10 oem or retail dvd/usb drive ready and begin the installation.
Setting up windows 10 and restoring programs you use should roughly 3 hours at best.